.red {
  color: red;
}

.App {
  border: 1px solid red;
  padding: 10px;

}

.App > .son {
  padding: 10px;
  background: aquamarine;
}
.App > .son> .grandson{
  padding: 10px;
  background: red;
}

.red{
  background: red;
  color: white;
}
.blue{
  background: blue;
  color: white;
}